{"id":8299,"date":"2026-05-29T17:59:21","date_gmt":"2026-05-29T17:59:21","guid":{"rendered":"https:\/\/www.yunrui-controls.com\/?p=8299"},"modified":"2026-05-29T17:59:21","modified_gmt":"2026-05-29T17:59:21","slug":"relief-valve-vs-pressure-reducing-valve-vs-sequence-valve","status":"publish","type":"post","link":"https:\/\/www.yunrui-controls.com\/ja\/relief-valve-vs-pressure-reducing-valve-vs-sequence-valve\/","title":{"rendered":"\u30ea\u30ea\u30fc\u30d5\u30d0\u30eb\u30d6\u3001\u6e1b\u5727\u5f01\u3001\u30b7\u30fc\u30b1\u30f3\u30b9\u30d0\u30eb\u30d6\uff1a\u4e3b\u306a\u9055\u3044"},"content":{"rendered":"<div style=\"max-width: 1000px; margin: 0 auto; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; line-height: 1.8; color: #333; background: #fafafa; padding: 20px;\">\n<p><!-- Title Section --><\/p>\n<div style=\"background: #1e3a5f; color: white; padding: 50px 40px; margin: -20px -20px 40px -20px;\">\n<h1 style=\"margin: 0; font-size: 2.5em; font-weight: bold; letter-spacing: -0.5px;\"><span style=\"color: #ffffff;\">Relief Valve vs Pressure Reducing Valve vs Sequence Valve<\/span><\/h1>\n<p style=\"margin: 15px 0 0 0; font-size: 1.2em; opacity: 0.9; font-weight: 300;\">Core Differences in Hydraulic Pressure Control Valves<\/p>\n<\/div>\n<p><!-- Quick Navigation --><\/p>\n<div style=\"background: white; padding: 25px; margin-bottom: 30px; border-left: 4px solid #e74c3c;\">\n<h3 style=\"margin: 0 0 15px 0; color: #e74c3c; font-size: 1.1em;\">Article Overview<\/h3>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 10px; font-size: 0.95em;\">\n<div>\u2022 Structural principles of three valve types<\/div>\n<div>\u2022 Control pressure and drain method comparison<\/div>\n<div>\u2022 Valve port state and operating characteristics<\/div>\n<div>\u2022 Engineering applications and selection criteria<\/div>\n<\/div>\n<\/div>\n<p><!-- Section 1: Fundamentals --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">I. Fundamental Concepts and Common Principles<\/h2>\n<p>Hydraulic valves are essential components in hydraulic transmission systems, used to control fluid pressure, flow rate, and direction. Among pressure control valves, the primary types include <strong>relief valves, pressure reducing valves, sequence valves, and unloading valves<\/strong>.<\/p>\n<div style=\"background: #fff3cd; border-left: 4px solid #ffc107; padding: 20px; margin: 25px 0;\">\n<h4 style=\"margin: 0 0 10px 0; color: #856404;\">Core Common Principle<\/h4>\n<p style=\"margin: 0; color: #856404;\">These three pressure control valves operate on the <strong>same fundamental principle<\/strong>: using controlled pressure oil to open and close valve ports. Understanding this is the foundation for distinguishing their differences.<\/p>\n<\/div>\n<p><!-- Section 2: Relief Valve --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">II. Relief Valve<\/h2>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">2.1 Working Principle<\/h3>\n<p>A relief valve is a hydraulic pressure control valve primarily serving four functions: <strong>pressure setting relief, pressure stabilization, system unloading, and safety protection<\/strong>.<\/p>\n<div style=\"background: white; padding: 25px; margin: 20px 0; border: 1px solid #e0e0e0;\">\n<h4 style=\"margin: 0 0 15px 0; color: #e74c3c; font-size: 1.1em;\">Detailed Operating Process<\/h4>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li style=\"margin-bottom: 8px;\"><strong>Low Pressure State:<\/strong> When inlet pressure is low, the main valve spool remains closed under spring force, valve port closed<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pressure Increase:<\/strong> As inlet pressure rises, oil flows through the damping orifice into the upper chamber of the main valve spool, simultaneously acting on the pilot valve spool<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pilot Valve Opens:<\/strong> When pressure reaches the set value, the pilot valve opens, allowing oil to flow back to the tank through the pilot valve<\/li>\n<li><strong>Main Valve Opens:<\/strong> A pressure differential is created across the main valve spool. When the force generated by this differential exceeds the spring force, the main valve spool lifts, allowing large volumes of oil to overflow back to the tank<\/li>\n<\/ul>\n<\/div>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">2.2 Technical Parameter Characteristics<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; background: white;\">\n<tbody>\n<tr style=\"background: #1e3a5f; color: white;\">\n<th style=\"padding: 12px 15px; text-align: left; width: 30%;\">\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n<th style=\"padding: 12px 15px; text-align: left;\">Relief Valve Characteristic<\/th>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">\u5236\u5fa1\u5727\u529b<\/td>\n<td style=\"padding: 12px 15px;\">Inlet pressure control, maintains constant inlet pressure<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Normal State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port normally closed<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Operating State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port opens, oil overflows to tank<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Drain Method<\/td>\n<td style=\"padding: 12px 15px;\">Internal drain &#8211; spring chamber oil drains internally to outlet<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 15px; font-weight: 600;\">Working Mode<\/td>\n<td style=\"padding: 12px 15px;\">Passive operation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- Section 3: Pressure Reducing Valve --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">III. Pressure Reducing Valve<\/h2>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">3.1 Working Principle<\/h3>\n<p>A pressure reducing valve is used to <strong>reduce pressure in a branch circuit<\/strong>, maintaining outlet pressure lower and more stable than the main circuit pressure.<\/p>\n<div style=\"background: white; padding: 25px; margin: 20px 0; border: 1px solid #e0e0e0;\">\n<h4 style=\"margin: 0 0 15px 0; color: #27ae60; font-size: 1.1em;\">Detailed Operating Process<\/h4>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li style=\"margin-bottom: 8px;\"><strong>Initial State:<\/strong> Valve port at maximum opening position, valve port normally open<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pressure Regulation:<\/strong> Outlet pressure oil enters the lower chamber of the main valve spool through the damping orifice, simultaneously acting on the pilot valve<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pressure Balance:<\/strong> When outlet pressure is below the set value, the pilot valve remains closed, main valve spool maintains maximum opening<\/li>\n<li><strong>Pressure Reducing Action:<\/strong> When outlet pressure reaches the set value, the pilot valve opens, the main valve spool moves upward, valve port narrows, restricting flow to maintain stable outlet pressure<\/li>\n<\/ul>\n<\/div>\n<div style=\"background: #e8f8f5; border-left: 4px solid #27ae60; padding: 20px; margin: 25px 0;\">\n<p style=\"margin: 0; color: #155724;\"><strong>Key Difference:<\/strong> The pressure reducing valve operates in <strong>active mode<\/strong>. Within the set pressure range, the reducing valve is also closed like a relief valve. However, as system pressure increases and reaches the reducing valve set pressure, the reducing valve opens, allowing some oil to return to the tank, and the pressure in this branch circuit will not increase further. The reducing valve provides <strong>pressure reduction and stabilization<\/strong> for this branch circuit.<\/p>\n<\/div>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">3.2 Technical Parameter Characteristics<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; background: white;\">\n<tbody>\n<tr style=\"background: #1e3a5f; color: white;\">\n<th style=\"padding: 12px 15px; text-align: left; width: 30%;\">\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n<th style=\"padding: 12px 15px; text-align: left;\">Pressure Reducing Valve Characteristic<\/th>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">\u5236\u5fa1\u5727\u529b<\/td>\n<td style=\"padding: 12px 15px;\">Outlet pressure control, maintains constant outlet pressure<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Normal State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port normally open<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Operating State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port narrows, restricting flow<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Drain Method<\/td>\n<td style=\"padding: 12px 15px;\">External drain &#8211; has separate drain port<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 15px; font-weight: 600;\">Working Mode<\/td>\n<td style=\"padding: 12px 15px;\">Active operation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- Section 4: Sequence Valve --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">IV. Sequence Valve<\/h2>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">4.1 Working Principle<\/h3>\n<p>A sequence valve is used in systems with <strong>two or more branch circuits<\/strong> to control the <strong>operating sequence of multiple actuators<\/strong> based on circuit pressure.<\/p>\n<div style=\"background: white; padding: 25px; margin: 20px 0; border: 1px solid #e0e0e0;\">\n<h4 style=\"margin: 0 0 15px 0; color: #3498db; font-size: 1.1em;\">Detailed Operating Process<\/h4>\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li style=\"margin-bottom: 8px;\"><strong>Initial State:<\/strong> Valve port closed, Actuator A operates, Actuator B does not operate<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pressure Build-up:<\/strong> When Actuator A completes its stroke, system pressure increases<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Sequential Opening:<\/strong> When pressure reaches the sequence valve set value, valve port opens<\/li>\n<li><strong>Actuator B Operation:<\/strong> Pressure oil enters Actuator B, achieving sequential motion control<\/li>\n<\/ul>\n<\/div>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">4.2 Multi-Function Applications<\/h3>\n<p>Depending on configuration, sequence valves can perform different circuit functions:<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin: 20px 0;\">\n<div style=\"background: white; padding: 20px; border-top: 3px solid #e74c3c;\">\n<h4 style=\"margin: 0 0 10px 0; color: #e74c3c; font-size: 1em;\">1. Relief Valve Function<\/h4>\n<p style=\"margin: 0; font-size: 0.9em; color: #666;\">Internal control, internal drain<\/p>\n<\/div>\n<div style=\"background: white; padding: 20px; border-top: 3px solid #27ae60;\">\n<h4 style=\"margin: 0 0 10px 0; color: #27ae60; font-size: 1em;\">2. Sequence Control<\/h4>\n<p style=\"margin: 0; font-size: 0.9em; color: #666;\">Controls sequential action<\/p>\n<\/div>\n<div style=\"background: white; padding: 20px; border-top: 3px solid #3498db;\">\n<h4 style=\"margin: 0 0 10px 0; color: #3498db; font-size: 1em;\">3. Backpressure Valve<\/h4>\n<p style=\"margin: 0; font-size: 0.9em; color: #666;\">Internal control, external drain<\/p>\n<\/div>\n<div style=\"background: white; padding: 20px; border-top: 3px solid #9b59b6;\">\n<h4 style=\"margin: 0 0 10px 0; color: #9b59b6; font-size: 1em;\">4. Unloading Valve<\/h4>\n<p style=\"margin: 0; font-size: 0.9em; color: #666;\">External control, internal drain<\/p>\n<\/div>\n<div style=\"background: white; padding: 20px; border-top: 3px solid #f39c12;\">\n<h4 style=\"margin: 0 0 10px 0; color: #f39c12; font-size: 1em;\">5. Balance Valve<\/h4>\n<p style=\"margin: 0; font-size: 0.9em; color: #666;\">Prevents uncontrolled descent<\/p>\n<\/div>\n<\/div>\n<h3 style=\"color: #2c3e50; margin-top: 25px; font-size: 1.3em;\">4.3 Technical Parameter Characteristics<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; background: white;\">\n<tbody>\n<tr style=\"background: #1e3a5f; color: white;\">\n<th style=\"padding: 12px 15px; text-align: left; width: 30%;\">\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n<th style=\"padding: 12px 15px; text-align: left;\">Sequence Valve Characteristic<\/th>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">\u5236\u5fa1\u5727\u529b<\/td>\n<td style=\"padding: 12px 15px;\">Inlet or external pressure control<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Normal State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port normally closed<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Operating State<\/td>\n<td style=\"padding: 12px 15px;\">Valve port opens, oil flows through<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 12px 15px; font-weight: 600;\">Drain Method<\/td>\n<td style=\"padding: 12px 15px;\">External drain<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px 15px; font-weight: 600;\">Working Mode<\/td>\n<td style=\"padding: 12px 15px;\">Passive operation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- Section 5: Comprehensive Comparison --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">V. Core Differences Comparison<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 25px 0; font-size: 14px; background: white; box-shadow: 0 2px 8px rgba(0,0,0,0.1);\">\n<thead>\n<tr style=\"background: #1e3a5f; color: white;\">\n<th style=\"padding: 15px; text-align: left; width: 20%;\">Comparison<\/th>\n<th style=\"padding: 15px; text-align: left; width: 26%;\">\u5b89\u5168\u5f01<\/th>\n<th style=\"padding: 15px; text-align: left; width: 27%;\">Pressure Reducing<\/th>\n<th style=\"padding: 15px; text-align: left; width: 27%;\">Sequence Valve<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 15px; font-weight: 600;\">\u5236\u5fa1\u5727\u529b<\/td>\n<td style=\"padding: 15px;\">Inlet pressure<\/td>\n<td style=\"padding: 15px;\">Outlet pressure<\/td>\n<td style=\"padding: 15px;\">Inlet or external<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 15px; font-weight: 600;\">Normal State<\/td>\n<td style=\"padding: 15px;\">Normally closed<\/td>\n<td style=\"padding: 15px;\">Normally open<\/td>\n<td style=\"padding: 15px;\">Normally closed<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 15px; font-weight: 600;\">Operating State<\/td>\n<td style=\"padding: 15px;\">Opens (overflow)<\/td>\n<td style=\"padding: 15px;\">Narrows<\/td>\n<td style=\"padding: 15px;\">Opens<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0;\">\n<td style=\"padding: 15px; font-weight: 600;\">Drain Method<\/td>\n<td style=\"padding: 15px;\">Internal drain<\/td>\n<td style=\"padding: 15px;\">External drain<\/td>\n<td style=\"padding: 15px;\">External drain<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e0e0e0; background: #f9f9f9;\">\n<td style=\"padding: 15px; font-weight: 600;\">\u4e3b\u8981\u6a5f\u80fd<\/td>\n<td style=\"padding: 15px;\">Safety protection<\/td>\n<td style=\"padding: 15px;\">Pressure reduction<\/td>\n<td style=\"padding: 15px;\">Sequential control<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 15px; font-weight: 600;\">Working Mode<\/td>\n<td style=\"padding: 15px;\">Passive<\/td>\n<td style=\"padding: 15px;\">Active<\/td>\n<td style=\"padding: 15px;\">Passive<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- Section 6: Fisher Brand --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">VI. About Fisher<\/h2>\n<div style=\"background: white; padding: 30px; margin: 25px 0; border: 1px solid #e0e0e0;\">\n<p style=\"margin: 0 0 20px 0;\"><a style=\"color: #e74c3c; text-decoration: none; font-weight: 600; font-size: 1.1em;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/brands\/fisher\/\">\u30d5\u30a3\u30c3\u30b7\u30e3\u30fc<\/a> is a leading brand in industrial process control, providing comprehensive solutions for pressure control, flow control, and process safety applications.<\/p>\n<p style=\"margin: 0;\">For industrial process control valves and instrumentation, YUNRUI offers a complete range of <strong>Fisher products<\/strong> including control valves, regulators, positioners, and digital valve controllers. Contact us for technical support and product selection assistance.<\/p>\n<\/div>\n<p><!-- Section 7: Summary --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">VII. Summary<\/h2>\n<div style=\"background: #1e3a5f; color: white; padding: 30px; margin: 25px 0;\">\n<h3 style=\"margin: 0 0 20px 0; font-size: 1.3em;\"><span style=\"color: #ffffff;\">\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8<\/span><\/h3>\n<ul style=\"margin: 0; padding-left: 20px; line-height: 2;\">\n<li>Relief valve operates in <strong>passive mode<\/strong>, pressure reducing valve operates in <strong>active mode<\/strong><\/li>\n<li>Relief valve controls <strong>inlet pressure<\/strong>, pressure reducing valve controls <strong>outlet pressure<\/strong><\/li>\n<li>Relief valve has <strong>normally closed<\/strong> valve port, pressure reducing valve has <strong>normally open<\/strong> valve port<\/li>\n<li>Sequence valve can be used for <strong>multi-circuit sequential control<\/strong><\/li>\n<li>The three valves have different <strong>drain methods<\/strong><\/li>\n<\/ul>\n<\/div>\n<p><!-- Related Articles --><\/p>\n<h2 style=\"color: #1e3a5f; font-size: 1.8em; margin-top: 40px; padding-bottom: 10px; border-bottom: 2px solid #1e3a5f;\">\u304a\u3059\u3059\u3081\u306e\u66f8\u7c4d<\/h2>\n<div style=\"background: white; padding: 25px; margin: 25px 0; border: 1px solid #e0e0e0;\">\n<ul style=\"margin: 0; padding-left: 20px; line-height: 2.2;\">\n<li><a style=\"color: #1e3a5f; text-decoration: none; font-weight: 500;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/control-valve-waterproof-and-moisture-proof-measures\/\">\u5236\u5fa1\u5f01\u306e\u9632\u6c34\u30fb\u9632\u6e7f\u5bfe\u7b56\uff1a\u7523\u696d\u7528\u4fdd\u8b77\u5bfe\u7b56\u5b8c\u5168\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a style=\"color: #1e3a5f; text-decoration: none; font-weight: 500;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/fisher-ez-series-single-seated-control-valve-technical-profile\/\">\u30d5\u30a3\u30c3\u30b7\u30e3\u30fcEZ\u30b7\u30ea\u30fc\u30ba\uff1a\u30b7\u30f3\u30b0\u30eb\u30b7\u30fc\u30c8\u5236\u5fa1\u5f01\u306e\u6280\u8853\u6982\u8981<\/a><\/li>\n<li><a style=\"color: #1e3a5f; text-decoration: none; font-weight: 500;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/fisher-dvc6200-digital-valve-controller\/\">\u6280\u8853\u5206\u6790\uff1a\u30d5\u30a3\u30c3\u30b7\u30e3\u30fcDVC6200\u30c7\u30b8\u30bf\u30eb\u30d0\u30eb\u30d6\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u69cb\u9020\u3068\u52d5\u4f5c\u539f\u7406<\/a><\/li>\n<li><a style=\"color: #1e3a5f; text-decoration: none; font-weight: 500;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/fisher-657-and-fisher-667-diaphragm-actuators\/\">Fisher 657\u304a\u3088\u3073Fisher 667\u30c0\u30a4\u30e4\u30d5\u30e9\u30e0\u30a2\u30af\u30c1\u30e5\u30a8\u30fc\u30bf\uff1a\u6280\u8853\u6bd4\u8f03\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a style=\"color: #1e3a5f; text-decoration: none; font-weight: 500;\" href=\"https:\/\/www.yunrui-controls.com\/ja\/fisher-mr98-series-technical-specification\/\">Fisher MR98 Series Backpressure Regulators and Relief Valves<\/a><\/li>\n<\/ul>\n<\/div>\n<p><!-- Contact --><\/p>\n<div style=\"background: #f5f5f5; padding: 30px; text-align: center; margin: 40px 0;\">\n<h3 style=\"margin: 0 0 15px 0; color: #1e3a5f;\">\u6280\u8853\u30b3\u30f3\u30b5\u30eb\u30c6\u30a3\u30f3\u30b0<\/h3>\n<p style=\"margin: 0 0 10px 0; color: #666;\">For more information about hydraulic systems and industrial valves<\/p>\n<p style=\"margin: 0;\"><a href=\"mailto:sales@yunrui-controls.com\"><span style=\"color: #e74c3c; font-weight: 600;\">sales@yunrui-controls.com<\/span><\/a><\/p>\n<\/div>\n<p style=\"color: #999; font-size: 0.85em; margin-top: 30px; padding-top: 20px; border-top: 1px solid #ddd;\">Last Updated: May 2026 | Categories: Hydraulic Valves, Pressure Control Valves, Technical Guides<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Relief Valve vs Pressure Reducing Valve vs Sequence Valve Core Differences in Hydraulic Pressure Control Valves Article Overview \u2022 Structural principles of three valve types \u2022 Control pressure and drain method comparison \u2022 Valve port state and operating characteristics \u2022 Engineering applications and selection criteria I. Fundamental Concepts and Common Principles Hydraulic valves are essential [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7959,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[384,1],"tags":[495,496,497,498,489,414,312],"class_list":["post-8299","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-blogs","tag-sequence-valve","tag-hydraulic-valves","tag-pressure-control","tag-industrial-valves","tag-relief-valve","tag-fisher-valves","tag-pressure-reducing-valve"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Relief Valve vs Pressure Reducing Valve vs Sequence Valve<\/title>\n<meta name=\"description\" content=\"Learn the core differences between relief valves, pressure reducing valves, and sequence valves. 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